🚙

P0171 Error Code

Ford vehicle

⚠️ WarningFordvehicle

📋 What Does P0171 Mean?

System too lean (Bank 1) — the engine is getting too much air or too little fuel.

💰Estimated repair cost: $50–$400

🔍 Common Causes

1Vacuum leak (cracked intake hose, loose connections)
2Dirty mass airflow (MAF) sensor
3Clogged fuel injectors
4Weak fuel pump or clogged fuel filter
5Faulty O2 sensor

📞 When to Call a Pro

If vacuum leak source cannot be found, a smoke test by a mechanic will locate it quickly.

Estimated Cost

$50–$400

🔧 DIY Fix Steps

1Inspect all intake hoses for cracks — especially after the air filter
2Clean the MAF sensor with MAF sensor cleaner spray ($8)
3Add a bottle of fuel injector cleaner to a full tank
4Listen for hissing sounds near the intake when engine is running (vacuum leak indicator)

🔄

How to Reset After Fixing

Fix underlying cause, clear code with OBD scanner. Code will return if not fixed.

Frequently Asked Questions

What does P0171 mean on a Ford vehicle?

System too lean (Bank 1) — the engine is getting too much air or too little fuel.

Can I fix P0171 myself?

Yes, in many cases. Start with: inspect all intake hoses for cracks — especially after the air filter If that does not resolve it, if vacuum leak source cannot be found, a smoke test by a mechanic will locate it quickly.